I want to re-render a portion of a form with an ajax call in Play 2.0.

So, I have a form that calls a jQuery load to re-render a sub portion of that form. The form template includes the sub template that I want to re-render. So, I already have the proper portion of the form in its own template. The difficulty arises because that template is included in the parent through a repeat. And, that repeat automagically converts the backing data model into a Play Field object. I can't seem to construct a Field on my own, but should I even be trying too? Given the dearth of information about this, I clearly must be doing something radically wrong here ...

So, is any of this vaguely correct? Should I just embed my sub template in a simple
form and use a JQuery selector on the resulting html? Is there some (other) way to
re-render a portion of a form through an ajax call?